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Combustion motor came back on without a call for heat and will not shut off. Checked the limits. One is manual roll out and another auto at the indoor fan motor. Gas valve opens and shuts from the thermostat. First one of these I have installed... looks like a Carrier. I suspect a micro relay on the board. Any ideas?

If I owned Chevy & then I bought Ford, wouldn't I be considered the owner of both companies? I think so. And if you think UT isn't gonna incorporate some parts into both co.'s you'd be high. Watch. Wait. You'll see.